Desenvolvimento de método espectrofotométrico para análise de paraformaldeído em saneantes comerciais e industriais
Main Article Content
Abstract
O presente artigo descreve uma metodologia espectrofotométrica para a análise de paraformaldeído presente em amostras de saneantes comerciais e industriais, utilizando-se ácido cromotrópico (ACT), ácido clorídrico concentrado e peróxido de hidrogênio, produzindo um composto púrpura - avermelhado (l max = 575 nm). A lei de Beer é obedecida numa faixa de concentração de 0,8 - 4,8 mg L-1 em formaldeído, apresentando excelente coeficiente de correlação (r = 0,9999). Os valores obtidos nas análises concordaram muito favoravelmente com os obtidos pelo procedimento padrão recomendado pelo NIOSH (National Institute for Occupational Safety and Health).
Metrics
Article Details
![Creative Commons License](http://i.creativecommons.org/l/by/4.0/88x31.png)
This work is licensed under a Creative Commons Attribution 4.0 International License.
The corresponding author transfers the copyright of the submitted manuscript and all its versions to Eclet. Quim., after having the consent of all authors, which ceases if the manuscript is rejected or withdrawn during the review process.
When a published manuscript in EQJ is also published in other journal, it will be immediately withdrawn from EQ and the authors informed of the Editor decision.
Self-archive to institutional, thematic repositories or personal webpage is permitted just after publication. The articles published by Eclet. Quim. are licensed under the Creative Commons Attribution 4.0 International License.
References
AMAN, T. et al. Spectrophotometric determination of amitriptyline-HCl in pure and pharmaceutical preparations. Anal. Lett., v.33, p. 2477-2490, 2000. [ Links ]
ASSOCIATION OF OFFICIAL ANALYTICAL CHEMISTS. Official methods of analysis of AOAC International: AOAC official method 898.01 – Formaldehyde in pesticide formulations, hydrogen peroxide method. 16th.ed. Arlington: AOAC INTERNATIONAL, 1995, v.2, p.99. [ Links ]
BALMAT, J. L., MEADOWS, G. W. Monitoring of formaldehyde in air. Am. Ind. Hyg. Assoc. J., v.46, p.578-584, 1985. [ Links ]
BASSET, J. et al. Análise inorgânica quantitativa. 4.ed. Rio de Janeiro: Guanabara Dois, 1981. p.265. [ Links ]
BRICKER, C. E.; VAIL, W. A. Microdetermination of formaldehyde with chromotropic acid. Anal. Chem., v.22, p.720-722, 1950. [ Links ]
DEDOV, A. G. et al. Indirect determination of formaldehyde by alternating-current voltammetry at a hanging mercury drop in the presence of oxygen. J. Anal. Chem., v.55, p.583-585, 2000. [ Links ]
EKBERG, D. R.; SILVER, E. C. Rapid spectrophotometric method for formaldehyde detection. Anal. Chem., v.38, p.1421-1422, 1966. [ Links ]
ELECTRON microscopy sciences - Paraformaldehyde solution 16%. Disponível em: : <http://www.emsdiasum.com/ems/chemicals/nma.html#15700>. Acesso em: 30 mar 2001. [ Links ]
FAGNANI, E.; MELIOS, C. B.; PEZZA, L.; PEZZA, H. R. Chromotropic acid - formaldehyde reaction in strongly acid aqueous media. The role of molecular oxygen. Anal. Chim. Acta, 2002. Submetido. [ Links ]
FORMALDEHYDE in air. MDHS 19. London: Health and Safety Executive, HMSO, 1983 apud PICKARD, A. D.; CLARK, E. R. The determination of traces of formaldehyde. Talanta, v.31, p.763-771, 1984. [ Links ]
GEORGHIOU, P. E.; HO, C. K. The Chemistry of the chromotropic acid method for the analysis of formaldehyde. Can. J. Chem., v.67, p.871-876, 1989. [ Links ]
BRASIL. Governo Federal. Farmacopéia brasileira: formaldeído, solução. 4.ed. São Paulo: Atheneu, 1988. parte 1, p.XII.2.-13. [ Links ]
HODGMAN, C.D. (Ed.). Handbook of chemistry and physics. 42nd.ed. Cleveland: The Chemical Rubber, 1960. p.1172-1173. [ Links ]
HASLAM, J.; SQUIRRELL, D. C. M. Further observations on automatic titrimetry. Analyst, v.82, p.511-517, 1957. [ Links ]
HAWLEY diccionario de química y de productos químicos. Barcelona: Omega, 1993. p.755. [ Links ]
HOPPS, H. PurpaldÒ : a reagent that turns aldehydes purple! Aldrich Acta, v.33, p.28-30, 2000. [ Links ]
UNIVERSIDADE ESTADUAL PAULISTA. Instituto de Química. Normas para organização e funcionamento do depósito de drogas para pesquisa e para gerenciamento de resíduos químicos. Disponível em : <http://intranet.iq.unesp.br/apoiotec/droga.htm> . Acesso em: 21 fev. 2001. [ Links ]
KOUPPARIS, M. A.; EFSTATHIOU, C. E.; HADJIIOANNOU, P. Kinetic determination of formaldehyde and hexamethylenetetramine with a cyanide-selective electrode. Anal. Chim. Acta, v.107, p.91-100, 1979. [ Links ]
LEE, C. W.; FUNG, Y. S.; FUNG, K.W. Determination of formaldehyde vapor in the atmospheres of clinical laboratories using chromotropic acid. Analyst, v.107, p.30-34, 1982. [ Links ]
LODGE JR, J. P. Methods of air sampling and analysis. 3rd.ed. London: Longman, 1971. p.350. [ Links ]
MILKSCH, R. R. et al. Modified pararosaniline meted for the determination of formaldehyde in air. Anal. Chem., v.53, p.2118-2123, 1981. [ Links ]
NATIONAL INSTITUTE FOR OCCUPATIONAL SAFETY AND HEALTH. NIOSH manual of analytical methods (NMAN): method 3500(2) – Formaldehyde, 4th.ed. 1994. p.1-5. [ Links ]
PICKARD, A. D.; CLARK, E. R. The determination of traces of formaldehyde. Talanta, v.31, p.763-771, 1984. [ Links ]
Safety data for paraformaldehyde. Disponível em : <http://physchem.ox.ac.uk/MSDS/P/paraformaldehyde.html>. Acesso em: 30 mar 2001. [ Links ]
GANGOLLI, S. (Ed.). THE dictionary of substances and their effects. 2nd.ed. Cambridge: Royal Society of Chemistry, 1999. v.6, p. p8par-p9par. [ Links ]
BUDAVARI, S. (Ed.). THE Merck index. 12nd.ed. Whitehouse Station: Merck, 1996. p.1207. [ Links ]
VOGEL, A. I. Química analítica qualitativa. 5.ed. São Paulo: Mestre Jou, 1981. p.412. [ Links ]
WEST, P. W., SEN, B. Spectrophotometric determination of traces of formaldehyde. Fresenius Z. Anal. Chem., v.153, p.177-183, 1956. [ Links ]
WOO, C. S.; BARRY, S. E.; ZAROMB, S. Detection and estimation of part-per billion levels of formaldehyde using a portable high-throughput liquid absorption air sampler. Environ. Sci. Technol., v.32, p.169-176, 1998. [ Links ]